`if __name__ =='__main __'`在javascript es6模块中相当 [英] `if __name__ == '__main__'` equivalent in javascript es6 modules

问题描述

是否可以检查JavaScript文件是直接运行还是作为es6模块导入的一部分。

Is it possible to check if JavaScript file is being run directly or if it was required as part of an es6 module import.

例如，包括主脚本。

// main.js
import './other';

if (mainTest){
  console.log('This should run');
}

导入依赖。

// other.js
if (mainTest){
  console.log('This should never run');
}

包括< script src = main.js> < / script> 应该导致来自 main.js 而不是other.js的控制台消息。

including <script src=main.js></script> should result in the console message from main.js but not other.js.

我发现关于此问题的回答节点，但我专门针对es6导入感兴趣

I found the answer to this question with regards to node, but I am interested specifically for es6 imports

推荐答案

module.parent 将帮助您：

module.parent will help you:

if(module.parent) {
    console.log('required module')
} else {
    console.log('main')
}

这篇关于`if __name__ =='__main __'`在javascript es6模块中相当的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！